单项选择题

We can feel things are heavy because ______.

A．weight is a fixed quality in an object
B．they are far away from the center of the earth
C．of the earth's strong attraction for them
D．they are not taken away from the surface of the earth

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热门试题

单项选择题

If an object weighed one pound 8,000 miles above the earth, it would weigh ______ on the surface of the earth.

A．6 pounds
B．4 pounds
C．9 pounds
D．1/9 pound

单项选择题

The best title for this passage is______.

A．The Earth Weight
B．Weight in Space
C．Changing Weight on the Earth
D．Weight on and off the Earth